Brushless DC ring motor cooling system

Details Brushless DC ring motor cooling system Brushless DC ring motor cooling system

2005-06-28

2005-06-28

Martin, David (Department: 2837)

Electricity: motor control systems

Open loop speed control system for dc motor with commutator

C388S829000, C388S831000, C318S139000, C318S811000, C318S268000

Reexamination Certificate

active

06912353

ABSTRACT:
A method of operating a cooling fan in a cooling system for a vehicle includes determining a required speed of the cooling fan. First and second signals are provided to a motor controller operatively connected to a motor having a rotatable portion connected to the cooling fan. The first signal coarsely controls a rotational speed of the motor by adjusting a voltage level provided to the motor and the second signal finely controls the rotational speed of the motor by pulse width modulation so that the cooling fan rotates at the required speed.

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